[McMurdo]

Its a TX85 isn't it? The scart was a seperate board fitted through a knock-out on the back panel?

The BBC gives out, in addition to UHF, RGB TTL I think, I'm sure that's what the corresponding Microvitec Cub would've been on a DIN socket. The standard Sinclair Spectrum only has UHF but had an unofficial mod for composite video which ought to be scart compatible. TTL normally requires divider resistors hidden inside the scart lead but the guy who fitted the din input to the Ferg would've scaled it appropriately.